28489294391 has 2 divisors, whose sum is σ = 28489294392. Its totient is φ = 28489294390.

The previous prime is 28489294367. The next prime is 28489294397. The reversal of 28489294391 is 19349298482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28489294391 - 2²² = 28485100087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28489294391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28489294397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14244647195 + 14244647196.

It is an arithmetic number, because the mean of its divisors is an integer number (14244647196).

Almost surely, 2^28489294391 is an apocalyptic number.

28489294391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28489294391 is an equidigital number, since it uses as much as digits as its factorization.

28489294391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 59.

The spelling of 28489294391 in words is "twenty-eight billion, four hundred eighty-nine million, two hundred ninety-four thousand, three hundred ninety-one".